Roasting-furnace.



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' am Hmmm AP'FLIATIDH PLLED glkRJS, 199.

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l A a n n 110. 804,379, y 1111511111111 Nov. 1 1, 1905.

' W, CHASE.

R'OASTNG FUBNACE. APPLIGATION FILED 111111.13, 1899. RBNBWBD MAY 22,1905.

3 SHEETS--SHBET 2.

Mmmm NOV. 14, 1905.

A.. @L CHASE.

mxsrm@ FUBNAGE. FILED EALLN. 1899. RENEWED HAY 22.1905.

APPLIUATIGE 3 SHEETS mmm.

. well known in the art.

, archeo ii hlililljiii PATENT UFFME,

ARTHUR W. CHASE, Ui? AVGCA, WA, ASSIGNOR T0 THE CHASE Fili* NACE COMPANY, OF PHILADELPHI; PENNSYLVANXA, A {JORPOItfif HON 0F DELAWARE.

, ernennen-fusionne..

Specification of Letters Patent.

Patented Nov. 14, i965.

Application filari MarchlS, i899. Renewed May 22, 1905. Serial No. iltl.v

To all 10h/0in rit 71am/ concorre: y

Be it known that i', ARTHUR Wl CHASE, a.

' citizen of the United States., residing atAvoca,

do hereby deciare the foliowing to he e full,r

clear, und exact description oi the invention, suchae will enal'ueothers skilled 1n the art to whic i it :incertains toV multe and use the same.

My invention reiates to an improvement in roasting-furnaces, and is more especialiy designed for use in the treatment of sulfuret ores or ash 7 therefrom obtained in the man uiaeture oi sulfuric acid.

The object of my' invention'is to produce a eoniiict and comparatively inexpensive furnace, one that will not cioe' in action, one in which tue charge is freely exposed to heated air as well as 'to the heated products of coinbastiou in the furnace, that will autoniutically feed and liscluzrge, and hecepabl-cof handling censurer' large quantities ol' the charge'.

'ri/'ith rese objects in View my invention consists in thcconstructions and combinations ol" partsz s hereinafter described andclaimed.

in the accompanying drawings, Figure 1 is a longitudinai central section oi my improved furnace. liig. :2 is a central cross-sectiono'r' the same. Fig. 3 is a section onthe line 3,3 of the sume looking' in the direction of the arrows iiigz i, and Fig. #i shows amodilication ofthe screw conveyor.

A, A. represent end wells ot' the furnace; Bl,'the'side walls; (i, the top; i.) D l, the

l hridgeuvalls, and lil the grate-bars. v inthe top l) is a pipe c, which leads either vinto a chimney or into a washer for removing the gases evolved in the roasting operation, which muy be utilixod by standard means in the top ol' the wall A is a passaocj", tyhich may be closed by a slidiug'valvefand which .communicates with the hopper F, which adapted to .receive the charge to be roasted. 'lllie lower cud of this passage communicates with a trough (i, which is ill-shaped iu crossi section, open at the top, and made in sections dovctailod together, lasshown at 5;. 'lhc trough@ .is suynorted at its outer ends by the nails A A'4 and at the junction nl the scr-- tions by the.bridge-well, as at li, and, il'` desired.. between such supports by the cradle and cross-supports g g7 g3g g1" y, the object being to fully. support the troughs andtlieir charges while exposing the maximum surfaces of troughs and charges to `the action oit' the heated cir and the furnace products of combustion. The furnace muy be ot' any desired size, end the trough Gr muy be composed of any desired number of sections; hut it is desirable that outer ends of the troughs., the junctions of sections, and, where necessary, intermediate points on sections be supported, as shown. troughs (r G, supported hy the outer walls. the bridge-walls D' D, und the intermediate cradles and supports. Removable braces 'l are used to hold the troughs lirnniy in position. ,it isunderstood that i do not limit myself to three troughs, but mey-use any number.

Below the trough (ir arev similar" A'passnge r1 in the wall A connects the l troughs G G', and a similar passage g in the wall Aiconnects the troughs G' if. Connected with one end of the trough G2 is a disclmrge-iassage 11" in the wail A', which is adapted to be closed lby n sliding' valre gl. Suitable standards I i' are vlocated outside of the furnace, and journalcd inthese standards are hollow shafts H H' H, one beingv located in each trough. '.lhese shafts arc square in cross-section within the furnace und round outside of the furnace, and tothe square portions of the saine are fastened screw-con- Voyer flights It fr li, made in sections and sccured by bolts /z or by set-screw, as shown in Fig. 4. The'h'ights f1.' /ix are pitched in one direction and the flights fr in the opposite direction. v

/r /f il. if la. li. are removable doors orclosures bolted dir ectly to plates Pi, provided with openings and removably attached to the furnace-walls A A'. ii'lach closure 1is made in two parte' which lit around the corresnoruling shaft. liy this construction the interior parts or" the furnace cre mede easilyv accessible. 'lhese plates are provided with vertical slots oi souuiwhat ,f rrcater width than theI bolts et' thc closures f2" ,715, Ate., engaging therein for the purpose of allowing for the displacement or the troughs (i G" i2 under 4the furnace heat or for general aliuement of the conrcyers and troughs when necessary.

I O'O conveyer, or otherwise, secured in place on the shaft by the set-screws. I

On the shaft H are mounted spur-wheels d d', meshing, respectively, with similar gear- This gearing is so proportioned that the shaft H travels `faster than the shaft H and the shaft H2 faster than the shaft H. This. provision removes the material fed into the troughs G" ,G2 at a faster rate of travel and lesser stream than exists in the overlying trough. This not only obviates the possibility of clogging in the passages g2 g3, but provides that as the charge approaches the Aexit g4, the furnace heat increasing as the charge is fed into lower troughs, the charge stream is of smaller crosssection, thus more largely exposing the particles of the same to the action of the heated air and products of combustion in theA furhace. Two useful results are secured by this arrangement. ln roasting sulfuret ores the ii'rst part of the roasting must be conducted slowlyto secure the best results, while the vfinal roasting can proceed much faster. In the first trough, therefore, a large amount of slowly turned and conveyed ore is present. rlihe ore is in a thicker layer in the first trough than in .the second, and so on through the series. in the last trough there is a very thin layer of rapidly-moving ore in the iast stages of roasting. By this arrangement a much more elcient roasting is secured. 'The sec-l ond uscui result is that .there is no choking. Since each conveyer travelsfaster than the one above it, it follows that theupper con-Y veyer cannot push forward the ore too fast' and choke the trough" and connecting-pipe.

, 'f This chokingpr clogging action in the case of finely-pulverized ore, such as applicants furnace 1s designed to treat, is a serious drawback to all the oref'roasting/furnaces now in `the market., more especially with ores which have a tendency toirit or melt together, winch often/occurs during the operation of roasting."

Qn the shaft lH is mounted the bevel gearvvheel y,j-which is driven by any suitable means. (bloLshoWn.)A Besides the'standards I l other standards'K 'K' are provided, which aid in supportingthe gearing and the stud'- ing-boxes Jig/ir'. 7c, into which the pipes Z Z Adeli-fera cooling iiuidlfroln the main L.

rifhe. shafts H H Hgpass through journalboxes in the standard i' and into stuffing-- -f-ooxes E it R2, secured to said standard by "brackets fr rf, which are bolted to the standardand to the stuiingboxes. Pipes rv" 'r2 are connected to the stuiiing-boxes R R R2 and serve to discharge the water or other fluid .which passes through the shafts H H H.

vllhe operatiouis as follows: The crushed "cre or other material that itis desired to roast is fed into the hopper F and delivered through the passage f after the furnace has been ,suitable sections of complete pitches of the d subjected 'tothe action of heated aixnnd thel products 'of' furnace combustion orbeing `in contact with the heated trough or conveyer. When the charge reaches the other end of the ltroughs Gr,- it falls through the passage g2 into the trough G', where the roasting operation is continued. The charge then falls throughthe passage g3 into the-trough Gr2 and finally passes out through the passage g.

It is seen that in roasting a charge `during the preliminary heating and roasting in the trough AGr the cross-section of' the moving charge is the largest and 'that as the charge is more highly heated and the escape of gaseous compounds becomes relatively greater inv the lower troughs the cross-section of the charge isfsomewhat less, facilitating the'es'v cape of gases when this is a desirable feature, as well vassubjecting the particles ofthe charge to an increasing temperature, due to heated air and products of furnace combustion and'rnore frequent contact with the heated trough and conveyor. The size of the furnace, the speed of the conveyers both in travel of the charge and v,relatively to each other, and the degree of heat used are so regulated thatwhen the charge passes out of the furnace it is completely roasted.

lt is obvious that many changes within the scope ofthe'claims might be made' without departing from lthe spirit of my invention, and wish it to be expressly understood that IOO I do not limitxnyself to the exact *details` shown and described.

Having thus described my invention, what l claim as new, and desire to secure by Letters Patent of the United States, is

1. In a roastingdurnace the combination of a series of troughs, located one over the other and arranged to feed from oneto the other, conveyors 1n said troughs, means for operating said conveyors, said means being so pro' portionedas to drive the several conveyers at rates of speed increasing from the top to the bottom of the furnace, substantially as described.

` 2. 1n aroasting-furnace, the combination ci a series of troughs, located one above the other and arranged to feed from' one to the other, convcyers in said troughs provided with hol low shafts, means for driving said conveyers at increasing rates of speed from the top down? ward and 'independent means for supplying a IIO IIS

izo

cooling vfluid to' said hollow shafts, substantially as described.

3.- In a roasting-furnace, the combination of a series of troughs, each trough being U- shaped in cross-section and composed of reclay sections, convcyers provided with hollow shafts located in said troughs, means for driving said shafts at increasing rates-of speed from the top downward, und means for supplying o cooling fluid to said hollow shafts, substantially as described.

4. Ina r0nsting-furnnoo, tho combination of end walls having' passages thoroin, side walls, bridge-walls, U-shnped troughs` supportod by said end walls and made in sections, conveyors in said troughs` providodwith hollow shafts, moans for driving' sind conveyors at increasing` ratos of spoed from [ho top downward, und means for supplying o cooling fluid to said hollow shafts, suhstantinlly as described.

5. in a roznfztilig-furono@s the combination of end walls, having' passages thoroin :1nd openings bhorotln'oug'h, sliding;r volvos for somo of said passages, sido wallsa hridg'owalls, U- shunod troughs composed oi' lire-clay sections und supported on said ond' walls, oonvoy'ors, noch colnposod of o, hollow shalt :ind Soc-,tional flights soourod tlnn'oto, loontod in said troughs, moons for driving` said convoyors :it inoroeising' rotos olsnood 'roin tho Lon downward` moons lor supplying n cooling' fluid to szrid r hollow shafts, und roinovnhlal doors orrlosuros j for the ononings in thorud mills, sulrstnniizilly l :is desorilmd. 6. ln:Lroasting'-luruuro, lhooonlhiimlionof l l l l l 0nd walls` provdod with olnlning's, bridgewuilsmsoriosof U-shnlwd troughs supporlod hy snid und "walls, ronvovors in said troughs, moons for d|'i\'in;'soid ron\'l\o|'s. n philo providrd with Circular oponing's ndnplod Lo lil :Lround Lho oprning's in'ihr' ond mills7 sind pluto living' hrovidod willi slots, :ind rrniovi sscions able plates auch inode 'in wo around tho conveyor-shafts close the oponings in the ond i' boing' niljustdhl,r surs-d lo tho plot-o, snbst-antiully'os .osorihod. i", ino ronslix'1g'fu1'mCo, hooom'b' n sorics oi troughs, oon'rifyors i il having' hollow shafts, :nouns for dri'` :ale-ii conveyors nl'. inoroosiog' rr i tho Cop downward, :i plurnhtj of hoor noch shaft; on Lho driving` sido, pro

warping of tho shafts and 'nhoir disnloc by the .iririno lnorimnisni, :ind 1n, livoring' si cooling' duid Suid iaolio" suhsontislly :is dooorihod.

8. in u ronslingfurniico, hooo'niwmioo olf n serios' olt troughs., otheroonyo adopted lo drive. snid leonvoyo ratos ol'` spend fron; loo too dom stzinliziliy us d isorihod,

troughssunportod l supports und rouimnlo oh supporting' suid lroofgjhf;v suhsmnliziliy ns drsorhod.

ln trs: iinony whorrol iuliix my a-zigniuiuro in prosonro ol mvo witnfgsso# Witno?" J. rvucrzime lili/'wim JouwI ii iioixr. 

